Wear-resistant and high-temperature-resistant fluorocarbon powder coating and preparation method thereof

Abstract

The invention discloses a wear-resistant and high-temperature-resistant fluorocarbon powder coating and a preparation method thereof. Comprising the following steps: step 1, adding FEVE resin, a modified filler, a curing agent, a flatting agent and an antioxidant into a high-speed mixer, and mixing for 10-15 minutes until the materials are uniform to obtain a mixed raw material; and 2, transferring the mixed raw material into an extruder, extruding, tabletting, cooling, crushing, and screening with a standard sieve to obtain the fluorocarbon powder coating. The preparation method has the beneficial effects that the modified chitosan and the montmorillonite are compounded, the cerium salt is adopted for further modification, and after the obtained modified filler is added into a coating component, the wear resistance and the high-temperature resistance of a coating are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and specifically relates to a wear-resistant and high-temperature-resistant fluorocarbon powder coating and a preparation method thereof. Background Art

[0002] In the technical field of coatings, fluorocarbon powder coatings are widely used in the fields of architecture, automobiles, aerospace, etc. due to their excellent weather resistance, chemical corrosion resistance and self-cleaning performance.

[0003] However, traditional fluorocarbon powder coatings still have obvious deficiencies in high-temperature and friction environments, mainly manifested as poor wear resistance, easy aging or cracking at high temperatures, resulting in a decline in coating performance and a shortened service life. In the prior art, the wear resistance of the coating is usually improved by adding inorganic fillers (such as silica, silicon carbide, etc.), but the compatibility of these fillers with the resin matrix is poor and they are prone to agglomeration, affecting the uniformity and mechanical properties of the coating. In addition, some studies have tried to use organic-inorganic hybrid materials or nano-fillers, but due to the complex preparation process, high cost and insufficient high-temperature stability, it is difficult to meet the actual application requirements. In terms of high-temperature resistance performance, the prior art mostly relies on the temperature resistance of the resin itself or adds a small amount of high-temperature-resistant additives, but the effect is limited. Especially in a long-term high-temperature environment, the coating is prone to oxidative degradation or mechanical property deterioration.

[0004] Therefore, in order to solve the above problems, the present invention provides a wear-resistant and high-temperature-resistant fluorocarbon powder coating and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a wear-resistant and high-temperature-resistant fluorocarbon powder coating and a preparation method thereof.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A preparation method of a wear-resistant and high-temperature-resistant fluorocarbon powder coating includes the following steps:

[0008] Step 1: Add FEVE resin, modified filler, curing agent, leveling agent, antioxidant into a high-speed mixer, mix for 10 - 15 min until uniform to obtain a mixed raw material;

[0009] Step 2: Transfer the mixed raw material to an extruder, extrude and press into sheets, cool, crush, and sieve with a standard sieve to obtain the fluorocarbon powder coating.

[0010] Preferably, the mixed raw material includes the following components: by weight, 60 - 70 parts of FEVE resin, 5 - 8 parts of modified filler, 5 - 6 parts of curing agent, 0.5 - 0.8 part of leveling agent, 0.3 - 0.4 part of antioxidant.

[0011] More optimally, the preparation process of the modified filler is:

[0012] A1: Add modified chitosan to 5% acetic acid aqueous solution and stir until completely dissolved to obtain a modified chitosan solution; disperse sodium montmorillonite in deionized water, add the modified chitosan solution, stir magnetically for 1-2 hours at room temperature, filter, wash and dry to obtain a chitosan-montmorillonite composite;

[0013] A2: Add cerium nitrate hexahydrate to deionized water, adjust the pH to 5, add chitosan-montmorillonite complex, stir for 4-5 hours at 40-50°C, filter, wash, and vacuum dry at 80°C to obtain a modified filler.

[0014] In the scheme, under acidic conditions, the amino groups and pyridine nitrogen of the imidazole ring in the modified chitosan will be protonated, thereby undergoing ion exchange reactions with the cations between the montmorillonite layers. Since the modified chitosan molecules are large in size and have a flexible structure, their insertion into the montmorillonite layers will expand the interlayer structure and significantly increase the interlayer spacing. In addition, the amino and hydroxyl groups on the chitosan molecules can also form a hydrogen bond network with the water molecules between the layers, further enhancing the stability of the interlayer structure. At the same time, the introduction of modified chitosan increases the active sites on the montmorillonite surface, improving the subsequent Ce 3+ of load.

[0015] More optimally, the chitosan-montmorillonite composite raw material comprises the following components: by weight, 1-2 parts of modified chitosan, 100-110 parts of acetic acid aqueous solution, 10-12 parts of sodium-montmorillonite, and 200-220 parts of deionized water;

[0016] The modified filler raw material comprises the following components: by weight, 4-5 parts of cerium nitrate hexahydrate, 200-220 parts of deionized water, and 10-12 parts of chitosan-montmorillonite composite.

[0017] More optimally, the preparation process of the modified chitosan is:

[0018] S1: pentaerythritol, phosphorus trichloride and acetonitrile solution are mixed, and the temperature is raised to 70-80°C under a protective atmosphere, and the reaction is carried out for 2-3 hours. After the reaction is completed, the mixture is cooled to room temperature, washed and dried to obtain intermediate A;

[0019] S2: Mix the intermediate A with the acetonitrile solution, raise the temperature to 80-90°C under a protective atmosphere, then slowly drop distilled water, react for 1-2 hours, cool to room temperature after the reaction, wash and dry, transfer to dimethyl sulfoxide, add 2-aminobenzimidazole, raise the temperature to 70-80°C, react for 5-6 hours, cool to room temperature after the reaction, separate by centrifuge, wash, and dry to obtain a modifier;

[0020] S3: Add chitosan into 2% dilute acetic acid to obtain a chitosan solution; mix the modifier with dimethyl sulfoxide and stir evenly to obtain a modifier solution; add the modifier solution into the chitosan solution, raise the temperature to 70 - 80 °C, react for 4 - 5 h, and after the reaction ends, perform freeze-drying to obtain modified chitosan.

[0021] In the scheme, the four hydroxyl groups of pentaerythritol undergo nucleophilic substitution reactions with phosphorus trichloride. Two hydroxyl groups of pentaerythritol respectively attack the phosphorus atoms in two PCl3 molecules to form P - O - C bonds and release hydrogen chloride; due to the symmetric structure of pentaerythritol, spirocyclic dichlorophosphate, that is, intermediate A, is formed after the reaction. The specific reaction process is as follows:

[0022]

[0023] In the scheme, in an acetonitrile solvent, intermediate A slowly reacts with water. Water molecules attack the phosphorus atom and replace the chlorine atom to convert the phosphochloride group into a phosphohydroxyl group; then it reacts with the amino group of 2 - aminobenzimidazole to obtain the modifier. The specific reaction process is as follows:

[0024]

[0025] In the scheme, the phosphohydroxyl group contained in the modifier reacts with the amino group of chitosan to graft the modifier onto chitosan, thereby obtaining modified chitosan.

[0026] More preferably, the raw materials of intermediate A include the following components: by weight, 13 - 15 parts of pentaerythritol, 44 - 50 parts of phosphorus trichloride, and 78 - 80 parts of acetonitrile solution.

[0027] More preferably, the raw materials of the modifier include the following components: by weight, 8 - 10 parts of intermediate A, 50 - 55 parts of acetonitrile solution, 6 - 8 parts of distilled water, 100 - 110 parts of dimethyl sulfoxide, and 3 - 4 parts of 2 - aminobenzimidazole.

[0028] More preferably, the raw materials of the modified chitosan include the following components: by weight, 10 - 12 parts of chitosan, 100 - 120 parts of 2% dilute acetic acid, 5 - 8 parts of the modifier, and 60 - 80 parts of dimethyl sulfoxide.

[0029] Advantages of the present invention:

[0030] By compounding modified chitosan with montmorillonite and further modifying with cerium salts in the present invention, after adding the obtained modified filler into the coating components, the wear resistance and high-temperature resistance of the coating are significantly improved. Specifically as follows:

[0031] First: In the solution, by inserting flexible chitosan long chains between montmorillonite layers and constructing an elastic network structure similar to a spring, when the coating is subjected to external force impact or friction, these polymer chains can effectively absorb energy through stretching and bending deformation. This dynamic energy dissipation mechanism can significantly disperse stress concentration, thereby synergistically inhibiting the initiation and propagation of cracks. At the same time, the rigid layered structure of montmorillonite and the flexibility of chitosan are complementary, maintaining both the mechanical strength of the coating and endowing it with toughness, significantly improving the impact resistance.

[0032] Second: Cerium salts decompose to generate cerium oxide during high-temperature treatment. Cerium oxide has a high melting point and excellent thermal stability, and can form a dense ceramic-like protective film on the surface of the coating. This film can not only block the penetration of external oxygen and heat to the substrate, slowing down the thermal oxidation degradation of the substrate, but also reduce the absorption of thermal radiation by the coating through its high reflectivity, effectively improving the high-temperature resistance of the coating.

[0033] Third: The polar groups amino and pyridine-type nitrogen of imidazole ring contained in the modified chitosan can bind to the fluorocarbon chain of the resin through hydrogen bonds or van der Waals forces, while the non-polar groups (such as the aromatic ring of benzimidazole) are physically entangled with the hydrophobic region of the resin. This dual action enables the modified filler to be evenly dispersed in the resin matrix, avoiding local stress concentration caused by agglomeration. At the same time, the strong interfacial bonding between the filler and the matrix reduces phase separation, ensuring the overall denseness of the coating, thereby enhancing the anti-wear ability. Specific Embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0035] Example 1: A preparation method of a wear-resistant and high-temperature-resistant fluorocarbon powder coating includes the following steps:

[0036] Step 1: Add 60 parts of FEVE resin, 5 parts of modified filler, 5 parts of curing agent, 0.5 part of leveling agent, and 0.3 part of antioxidant to a high-speed mixer, and mix for 10 minutes until uniform to obtain a mixed raw material.

[0037] Step 2: Transfer the mixed raw material to an extruder, extrude and press into sheets, cool, crush, and sieve with a standard sieve to obtain the fluorocarbon powder coating.

[0038] Among them, the preparation process of the modified filler is:

[0039] A1: Add 1 part of modified chitosan into 100 parts of 5% acetic acid aqueous solution, stir until completely dissolved to obtain a modified chitosan solution; disperse 10 parts of sodium montmorillonite in 200 parts of deionized water, add the modified chitosan solution, and under room temperature, stir magnetically for 1 h, filter, wash, and dry to obtain a chitosan montmorillonite composite;

[0040] A2: Add 4 parts of cerium nitrate hexahydrate into 200 parts of deionized water, adjust the pH = 5, add 10 parts of the chitosan montmorillonite composite, stir at 40 °C for 4 h, filter, wash, and vacuum dry at 80 °C to obtain a modified filler;

[0041] Among them, the preparation process of the modified chitosan is as follows:

[0042] S1: Mix 13 parts of pentaerythritol, 44 parts of phosphorus trichloride, and 78 parts of acetonitrile solution, under a protective atmosphere, raise the temperature to 70 °C, react for 2 h, after the reaction ends, cool to room temperature, wash and dry to obtain intermediate A;

[0043] S2: Mix 8 parts of intermediate A with 50 parts of acetonitrile solution, under a protective atmosphere, raise the temperature to 80 °C, then slowly dropwise add 6 parts of distilled water, react for 1 h, after the reaction ends, cool to room temperature, wash and dry, transfer to 100 parts of dimethyl sulfoxide, add 3 parts of 2-aminobenzimidazole, raise the temperature to 70 °C, react for 5 h, after the reaction ends, cool to room temperature, separate by centrifuge, wash, and dry to obtain a modifier;

[0044] S3: Add 10 parts of chitosan into 100 parts of 2% dilute acetic acid to obtain a chitosan solution; mix 5 parts of the modifier with 60 parts of dimethyl sulfoxide, stir evenly to obtain a modifier solution; add the modifier solution into the chitosan solution, raise the temperature to 70 °C, react for 4 h, after the reaction ends, freeze-dry to obtain modified chitosan.

[0045] Example 2: A preparation method of a wear-resistant and high-temperature-resistant fluorocarbon powder coating, comprising the following steps:

[0046] Step 1: Add 70 parts of FEVE resin, 8 parts of modified filler, 6 parts of curing agent, 0.8 part of leveling agent, and 0.4 part of antioxidant into a high-speed mixer, mix for 15 min until uniform to obtain a mixed raw material;

[0047] Step 2: Transfer the mixed raw material to an extruder, extrude and press into sheets, after cooling, crush, and sieve with a standard sieve to obtain a fluorocarbon powder coating;

[0048] Among them, the preparation process of the modified filler is as follows:

[0049] A1: Add 2 parts of modified chitosan to 110 parts of 5% acetic acid aqueous solution, stir until completely dissolved to obtain a modified chitosan solution; disperse 12 parts of sodium montmorillonite in 220 parts of deionized water, add the modified chitosan solution, and under room temperature, magnetically stir for 2 h, filter, wash, and dry to obtain a chitosan montmorillonite composite;

[0050] A2: Add 5 parts of cerium nitrate hexahydrate to 220 parts of deionized water, adjust the pH = 5, add 12 parts of the chitosan montmorillonite composite, stir at 50 °C for 5 h, filter, wash, and vacuum dry at 80 °C to obtain a modified filler;

[0051] Among them, the preparation process of the modified chitosan is as follows:

[0052] S1: Mix 15 parts of pentaerythritol, 50 parts of phosphorus trichloride, and 80 parts of acetonitrile solution, under a protective atmosphere, raise the temperature to 80 °C, react for 3 h, after the reaction ends, cool to room temperature, wash and dry to obtain intermediate A;

[0053] S2: Mix 10 parts of intermediate A with 55 parts of acetonitrile solution, under a protective atmosphere, raise the temperature to 90 °C, then slowly dropwise add 8 parts of distilled water, react for 2 h, after the reaction ends, cool to room temperature, wash and dry, transfer to 110 parts of dimethyl sulfoxide, add 4 parts of 2-aminobenzimidazole, raise the temperature to 80 °C, react for 6 h, after the reaction ends, cool to room temperature, separate by centrifuge, wash, and dry to obtain a modifier;

[0054] S3: Add 12 parts of chitosan to 120 parts of 2% dilute acetic acid to obtain a chitosan solution; mix 8 parts of the modifier with 80 parts of dimethyl sulfoxide, stir evenly to obtain a modifier solution; add the modifier solution to the chitosan solution, raise the temperature to 80 °C, react for 5 h, after the reaction ends, freeze-dry to obtain modified chitosan.

[0055] Example 3: A preparation method of a wear-resistant and high-temperature-resistant fluorocarbon powder coating, comprising the following steps:

[0056] Step 1: Add 65 parts of FEVE resin, 6.5 parts of modified filler, 5.5 parts of curing agent, 0.65 parts of leveling agent, and 0.35 parts of antioxidant to a high-speed mixer, mix for 12.5 min until uniform to obtain a mixed raw material;

[0057] Step 2: Transfer the mixed raw material to an extruder, extrude and press into sheets, after cooling, crush, and sieve with a standard sieve to obtain a fluorocarbon powder coating;

[0058] Among them, the preparation process of the modified filler is as follows:

[0059] A1: Add 1.5 parts of modified chitosan into 105 parts of 5% acetic acid aqueous solution, stir until completely dissolved to obtain a modified chitosan solution; disperse 11 parts of sodium montmorillonite in 210 parts of deionized water, add the modified chitosan solution, and under room temperature, stir magnetically for 1.5 h, filter, wash, and dry to obtain a chitosan montmorillonite composite;

[0060] A2: Add 4.5 parts of cerium nitrate hexahydrate into 210 parts of deionized water, adjust the pH to 5, add 11 parts of the chitosan montmorillonite composite, stir at 45 °C for 4.5 h, filter, wash, and vacuum dry at 80 °C to obtain a modified filler;

[0061] Among them, the preparation process of the modified chitosan is as follows:

[0062] S1: Mix 14 parts of pentaerythritol, 47 parts of phosphorus trichloride, and 79 parts of acetonitrile solution, under a protective atmosphere, raise the temperature to 75 °C, react for 2.5 h, after the reaction ends, cool to room temperature, wash and dry to obtain intermediate A;

[0063] S2: Mix 9 parts of intermediate A with 52.5 parts of acetonitrile solution, under a protective atmosphere, raise the temperature to 85 °C, then slowly dropwise add 7 parts of distilled water, react for 1.5 h, after the reaction ends, cool to room temperature, wash and dry, transfer to 105 parts of dimethyl sulfoxide, add 3.5 parts of 2-aminobenzimidazole, raise the temperature to 75 °C, react for 5.5 h, after the reaction ends, cool to room temperature, separate by centrifuge, wash, and dry to obtain a modifier;

[0064] S3: Add 11 parts of chitosan into 110 parts of 2% dilute acetic acid to obtain a chitosan solution; mix 6.5 parts of the modifier with 70 parts of dimethyl sulfoxide, stir evenly to obtain a modifier solution; add the modifier solution into the chitosan solution, raise the temperature to 75 °C, react for 4.5 h, after the reaction ends, freeze-dry to obtain modified chitosan.

[0065] Comparative Example 1: Do not add the modified filler, and the rest is the same as in Example 3, specifically as follows:

[0066] Step 1: Add 65 parts of FEVE resin, 5.5 parts of curing agent, 0.65 parts of leveling agent, and 0.35 parts of antioxidant into a high-speed mixer, mix for 12.5 min until uniform to obtain a mixed raw material;

[0067] Step 2: Transfer the mixed raw material to an extruder, extrude and press into sheets, after cooling, crush, and sieve with a standard sieve to obtain a fluorocarbon powder coating.

[0068] Comparative Example 2: Do not modify chitosan, and the rest is the same as in Example 3, specifically as follows:

[0069] Step 1: Add 65 parts of FEVE resin, 6.5 parts of modified filler, 5.5 parts of curing agent, 0.65 parts of leveling agent, and 0.35 parts of antioxidant into a high-speed mixer, and mix for 12.5 min until uniform to obtain a mixed raw material;

[0070] Step 2: Transfer the mixed raw material to an extruder, extrude and press into sheets. After cooling, crush and screen with a standard sieve to obtain fluorocarbon powder coating;

[0071] Among them, the preparation process of the modified filler is as follows:

[0072] A1: Add 1.5 parts of chitosan into 105 parts of 5% acetic acid aqueous solution, stir until completely dissolved to obtain a chitosan solution; Disperse 11 parts of sodium montmorillonite in 210 parts of deionized water, add the chitosan solution, and stir magnetically at room temperature for 1.5 h, filter, wash, and dry to obtain a chitosan montmorillonite composite;

[0073] A2: Add 4.5 parts of cerium nitrate hexahydrate into 210 parts of deionized water, adjust the pH = 5, add 11 parts of chitosan montmorillonite composite, stir at 45 °C for 4.5 h, filter, wash, and vacuum dry at 80 °C to obtain the modified filler.

[0074] Detection test: Spray the fluorocarbon powder coatings obtained in the examples and comparative examples on the surface of an aluminum plate by electrostatic spraying, and then place them in an oven at 150 °C for curing for 10 min to form a coating, and conduct the following tests:

[0075] (1) Rub the coatings obtained in the examples and comparative examples with sandpaper, replace the sandpaper every 100 revolutions, and test a total of 300 revolutions, record the abrasion amount of the coating, and use it to evaluate the wear resistance;

[0076] (2) Refer to GB / T1732 to conduct an impact strength test on the coatings obtained in the examples and comparative examples;

[0077] (3) Place the specimens obtained in the examples and comparative examples in a constant temperature oven, set the temperature at 300 °C and keep it for 4 h, observe the surface conditions; The data obtained are shown in the following table:

[0078]

[0079] Table 1

[0080] Conclusion: In this invention, a wear-resistant and high-temperature resistant fluorocarbon powder coating was prepared by compounding modified chitosan with montmorillonite and further modifying with cerium salt, significantly improving the performance of the coating. Experimental data shows that the abrasion amounts of Examples 1, 2, and 3 are 86.7 mg, 85.3 mg, and 84.6 mg respectively, the impact strengths are 71 kg×cm, 76 kg×cm, and 78 kg×cm respectively, and there is no change on the surface at 300 °C; while the abrasion amount of Comparative Example 1 (without adding modified filler) is 110.8 mg, the impact strength is 55 kg×cm, and the surface cracks at high temperature; the abrasion amount of Comparative Example 2 (unmodified chitosan) is 96.8 mg, the impact strength is 65 kg×cm, and the surface turns yellow at high temperature. The results show that the addition of the modified filler significantly improves the wear resistance, impact resistance, and high-temperature resistance of the coating, and the synergistic effect of compounding modified chitosan with montmorillonite and cerium salt modification is particularly crucial, effectively enhancing the comprehensive performance of the coating.

[0081] In the description of the specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0082] The above content is only an example and illustration of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the invention or exceed the scope defined by the claims of this patent, they should fall within the protection scope of the present invention.

Claims

1. A method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating, characterized in that: The following steps are involved: Step 1: Add FEVE resin, modified filler, curing agent, leveling agent and antioxidant into a high-speed mixer and mix for 10-15 minutes until uniform to obtain a mixed raw material; Step 2: Transfer the mixed raw materials to an extruder, extrude and compress the raw materials into sheets, cool them, crush them, and sieve them with a standard sieve to obtain a fluorocarbon powder coating.

2. The method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating according to claim 1, characterized in that: The mixed raw material comprises the following components: by weight, 60-70 parts of FEVE resin, 5-8 parts of modified filler, 5-6 parts of curing agent, 0.5-0.8 parts of leveling agent, and 0.3-0.4 parts of antioxidant.

3. The method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating according to claim 1, characterized in that: The preparation process of the modified filler is: A1: Add modified chitosan to 5% acetic acid aqueous solution and stir until completely dissolved to obtain a modified chitosan solution; disperse sodium montmorillonite in deionized water, add the modified chitosan solution, stir magnetically for 1-2 hours at room temperature, filter, wash and dry to obtain a chitosan-montmorillonite composite; A2: Add cerium nitrate hexahydrate to deionized water, adjust the pH to 5, add chitosan-montmorillonite complex, stir for 4-5 hours at 40-50°C, filter, wash, and vacuum dry at 80°C to obtain a modified filler.

4. The method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating according to claim 3, characterized in that: The chitosan-montmorillonite composite raw material comprises the following components: by weight, 1-2 parts of modified chitosan, 100-110 parts of acetic acid aqueous solution, 10-12 parts of sodium-montmorillonite, and 200-220 parts of deionized water; The modified filler raw material comprises the following components: by weight, 4-5 parts of cerium nitrate hexahydrate, 200-220 parts of deionized water, and 10-12 parts of chitosan-montmorillonite composite.

5. The method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating according to claim 3, characterized in that: The preparation process of the modified chitosan is: S1: pentaerythritol, phosphorus trichloride and acetonitrile solution are mixed, and the temperature is raised to 70-80°C under a protective atmosphere, and the reaction is carried out for 2-3 hours. After the reaction is completed, the mixture is cooled to room temperature, washed and dried to obtain intermediate A; S2: Mix the intermediate A with the acetonitrile solution, raise the temperature to 80-90°C under a protective atmosphere, then slowly drop distilled water, react for 1-2 hours, cool to room temperature after the reaction, wash and dry, transfer to dimethyl sulfoxide, add 2-aminobenzimidazole, raise the temperature to 70-80°C, react for 5-6 hours, cool to room temperature after the reaction, separate by centrifuge, wash, and dry to obtain a modifier; S3: adding chitosan to 2% diluted acetic acid to obtain a chitosan solution; mixing a modifier with dimethyl sulfoxide, stirring evenly to obtain a modifier solution; adding the modifier solution to the chitosan solution, raising the temperature to 70-80°C, reacting for 4-5 hours, and after the reaction is completed, freeze-drying to obtain modified chitosan.

6. The method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating according to claim 5, characterized in that: The intermediate A raw material comprises the following components: by weight, 13-15 parts of pentaerythritol, 44-50 parts of phosphorus trichloride, and 78-80 parts of acetonitrile solution.

7. The method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating according to claim 5, characterized in that: The modifier raw material comprises the following components: by weight, 8-10 parts of intermediate A, 50-55 parts of acetonitrile solution, 6-8 parts of distilled water, 100-110 parts of dimethyl sulfoxide, and 3-4 parts of 2-aminobenzimidazole.

8. The method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating according to claim 5, characterized in that: The modified chitosan raw material comprises the following components: by weight, 10-12 parts of chitosan, 100-120 parts of 2% diluted acetic acid, 5-8 parts of modifier, and 60-80 parts of dimethyl sulfoxide.

9. A fluorocarbon powder coating obtained according to the method for preparing a wear-resistant and high-temperature resistant fluorocarbon powder coating according to any one of claims 1 to 8.

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